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General Category => Modellers At Work => Topic started by: Peter_T1958 on November 18, 2020, 10:45:16 AM



Title: Narrow gauge tramway loco
Post by: Peter_T1958 on November 18, 2020, 10:45:16 AM
Hi there

It’s been very quiet around me in the last month. One reason for this is, that I call my latest project (Steel Cable Transmission) done and I didn’t wanted to stick my neck out with my forthcoming project.

Now that the first clarifications are carried out, I would like show you what is on my workbench (or better on my desk, as I have no machinery at all...). I take a lot of inspiration in the work of Havard Houen and Volker Gerisch, also members of this forum. Above all, I want to build a locomotive out of brass. I know, without machinery this is a near impossible task, but this is one of my dreams for a long time.

Some of you may remember that most of my projects are rooted in my region; I always want to recreate a period in history.  And so the object of desire is a narrow gauge tramway loco that operated in my hometown from 1913 to 1971. And here ist the beauty (Ok, at the end of her career, her beauty faded slightly…):

(https://images40.fotki.com/v1075/photos/4/3824994/16308211/strassenbahnschaffhausen1klein-vi.jpg)

My technical and handicraft possibilities lie in particular in drawing etching templates and recently in 3d printing too. Nevertheless I require some assistance from you guys from time to time. I hope to post here my next steps soon.

First impressions:
Bogie side printed by Shapeways:
(https://images51.fotki.com/v1654/photos/4/3824994/16308211/IMG_20201106_155453-vi.jpg)

Coupler still in plastic also by shapeways:
(https://images20.fotki.com/v682/photos/4/3824994/16308211/8_33007374_17447379_1603871451-vi.jpg)

Etched brass parts
(https://images51.fotki.com/v1654/photos/4/3824994/16308211/IMG_20201118_174009-vi.jpg)


Cheers,
Peter


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on November 18, 2020, 01:57:10 PM
Volker, Helmut, and Frithjof seem to have found an outstanding guy for 3-D printing. You might want to find out more before settling on Shapeways. I look forward to watching your model come together. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Bernhard on November 18, 2020, 02:31:18 PM
Very nice project, Peter. What scale is it ?

Bernhard


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 18, 2020, 02:45:35 PM
It's 0m gauge, 1/45 scale. ::)


Title: Re: Narrow gauge tramway loco
Post by: Hauk on November 18, 2020, 03:02:22 PM
It's 0m gauge, 1/45 scale. ::)

Ahh, perfect!

I can´t wait to see how you will tackle the pantograph. I  desperately need some inspiration to tackle the pantographs for my next engine.
Reallyl looking forward to follow this build.

What are the wheels like, by the way? And what standards will you build the model to?


Title: Re: Narrow gauge tramway loco
Post by: Chuck Doan on November 18, 2020, 07:42:40 PM
Looking good!


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on November 19, 2020, 01:21:38 AM
Very interesting project, and you're off to a good start! I like the look of that electric loco, and love the weathered appearance. Will you be giving your model a similar appearance, or newer looking?


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 19, 2020, 04:02:50 AM
Thanks for your hints and questions. I am aware of the high standard in that forum and that's why I am prefere to post my work here. It's the only place I know, where not only nice words but constructive criticism is given.
But at this time it is still too early to expect answers about the planned work from me. Why?
Needless to say, the Proto 48 standard, would be my fist choice, but in lacking any machinery, that remains a dream. So I have to muddle through with what I am able to archieve. The Wheels for instance are from Slaters (I have read they are Finescale standard?!?) To match the 0m track the axles had to be milled some tenth of a millimetrer. Fortunately I found a watchmaker in the vicinity, tha made that for me - for money needless to say! He is also willing to rework future castings such as the motor and gear unit. In 0m scale all components have to find their place in a very small space.
With regards to the costs of such a project I had to go through rough times. Learning through trial and error meant, that the reject rate is very high, what increases the costs tredemous. That's why I concentrate now on the motor/bogie unit first not least because of the family bliss ;-D

@Ray
Of course, I would like to give my model a very weathered appearance. In my opinion such an "outfit" has much more charcter, is far more interesting!

@Havard
The pantographs are not on my focus yet, but I have a slight idea how to do them in the future. At "Jaffas-moba-shop.de" you can find an interesting approach (see -> download pdf document).

Cheers
Peter



Title: Re: Narrow gauge tramway loco
Post by: SandiaPaul on November 19, 2020, 05:25:56 AM
Hi Peter! Two questions...can you point out the link about the pantographs for this non German speaker?
Also who is your vendor for the etchings?


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 19, 2020, 10:36:33 AM
Hi Paul
I don’t know if it’s allowed to linkt a thread with a commercial site. So I have attached a screenshot. Here you can see the download area with the kit instructions in pdf. on the mentioned address.

(https://images40.fotki.com/v1668/photos/4/3824994/16308211/Jaffa_Shop-vi.jpg)

May be Havard could do some changes on such a commercial kit or (much better) create some similar brass parts. I’d probably do that in the distant future. To me the construction looks promising.

My etchings I ordered at Ätztechnik Herbert Caspers GmbH & Co. KG in Germany. The owner, Thomas Engel, is a modeller himself.



Title: Re: Narrow gauge tramway loco
Post by: Lawton Maner on November 19, 2020, 01:33:16 PM
     Before you bash yourself over the lack of tooling to do the work for you, look at some of the objects which were all hand made centuries ago by craftsman whose access to tooling and raw materials were quite limited.  Some of the pre-Roman work discovered in the UK is exacting even by this crowd's standards.  Also remember that practice makes you better as does a trash bin for parts which do not work out. 
     Remember that small parts take magnification to be able to see them, and clever ways to hold them while working on them.  Antique watches will provide inspiration beacuse of the challenges of size and accuracy.  Make it as good as you can now, and if necessary you can go back and replace parts once you get better.
     A mentor of mine told me years ago that when modeling you make the part the same way the full sized is done, only smaller.


Title: Re: Narrow gauge tramway loco
Post by: SandiaPaul on November 20, 2020, 05:17:55 AM
Thank you Peter!


Title: Re: Narrow gauge tramway loco
Post by: 1-32 on November 20, 2020, 10:29:33 PM
1/48 scale outstanding.


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 21, 2020, 01:18:02 PM
Make it as good as you can now, and if necessary you can go back and replace parts once you get better.
     
Oh yes, that’s what I am doing right now ;D Each part has to be replaced one or two times. And that is not as cheap when those parts are in brass! Although I am missing some tooling indeed, this is just one point. What I am missing most is that I have absolutely no experience in that sector. Let me add an example:

In drawing the bogie on my PC I was asking me how to construct the pivot bearing. As may have guessed already, I had neither an idea nor could find a concrete answer in the www. So I set off straight away and tried to find a solution. Perhaps this will work; otherwise it will become rather expensive again….

Here what I am planning: A pivot with a small turntable underneath (red in the screenshot).
(https://images20.fotki.com/v682/photos/4/3824994/16308211/y_Strassenbahn_SchSt_Ge4_473_K-vi.png)

To prevent the tilting oft he superstructure I intend to install small spring elements (orange in the second drawing).
(https://images34.fotki.com/v1212/photos/4/3824994/16308211/GetriebeB-vi.png)

May be someone has a great deal of experience or can provide some pictures?

Cheers, Peter

   



Title: Re: Narrow gauge tramway loco
Post by: finescalerr on November 21, 2020, 01:46:06 PM
Don't waste money or time. Just post your question here and somebody will give you the right answer. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Design-HSB on November 21, 2020, 04:15:37 PM
With the Xrot R12 I solved the following dimensions:

(http://www.design-hsb.de/R12Drehgestell01.jpg)
There are 2 different bogion frames and this is the rear.
However, the front bogie is already ready.
Since the slingshot has a gigantic model weight, the boguas actually have no suspension but end stops. These end stops are adjustable via the counter nuts. From these end stops, the wheels can still spring out of the springs by means of small compression springs.

(http://www.design-hsb.de/R12Drehgestell02.jpg)
Here the counter bearing from the bogie with an axial ball bearing like the model.

On the side, as with the model, there are only sliding plates, so that rocking prevents the construction. If your tram has to enter and exit in control tracks, it is recommended to make a bogie around the longitudinal axis tiltable and the other bogie to the other bogie. The axles of the R12 are minimally spring-loaded, but you can also achieve this excellently by a rocker technique of the bogies. For this purpose, the bogie must be divided lengthways and additionally made movable in the middle at the pivot point.

Definitely a very interesting project.


Title: Re: Narrow gauge tramway loco
Post by: Bernhard on November 22, 2020, 04:45:11 AM
Peter, I would suggest to fix the bogie to the locomotive body with a screw. If you tighten it carefully, you can adjust the axial play very small. The pivot and bore should have as little play as possible.
I would not recommend a spring preload. The bogie cannot turn freely with it, which can lead to derailment in curves.

Bernhard


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 22, 2020, 07:02:34 AM
For this purpose, the bogie must be divided lengthways and additionally made movable in the middle at the pivot point.

Hmm, this could work, even in such a small scale compared to your „huge“ Xrot! Would that mean, the second (rear) bogie should be non-motorised?!?

Peter, I would suggest to fix the bogie to the locomotive body with a screw. If you tighten it carefully, you can adjust the axial play very small. The pivot and bore should have as little play as possible. I would not recommend a spring preload. The bogie cannot turn freely with it, which can lead to derailment in curves.
Bernhard


Thanks for your hint - I didn't realise that! At some threads in different forums I could make out coils springs around the screw. Here a quick sketch:

(https://images15.fotki.com/v1669/photos/4/3824994/16308211/Pivot-vi.jpg)

This corresponds approximately what you are proposing, yes (?)



Title: Re: Narrow gauge tramway loco
Post by: Hauk on November 22, 2020, 09:51:50 AM
Regarding the attachment of the trucks (bogies) to the body; I used the "three legged stool" principle for my Westinghouse engines.  One bogie (A) is allowed to rotate freely in both planes. This is just like the drawing you postet right after I first posted this message!  The other (B) is allowed only to move in the horizontal plane.

(http://www.folk-rovere.org/mj/bilder/skisse_boggie_A_web.jpg)

(http://www.folk-rovere.org/mj/bilder/skisse_boggie_B_web.jpg)

I use that same principle for the wheelsets. One axle is fixed to the bogie (two "legs"), and the other is allowed to swivel sligtly (one "leg"). This works well for my bogies, since only the fixed axle is powered. A more elegant solution for making sure that all the wheels are in contact with the track would be to use sprung axleboxes. Unfortunately, mys skills are not yet up to that task.

When it comes to the wheels, have you compared the prototype wheel profile against your chosen Slater Wheels? I dont know If you you are planning a stand-alone model or have plans for more rolling stock and perhaps a layout. If the latter is the case, you should consider a complete set of standards. This would include wheel profile, back-to-back, exact track gauge, check gauge etc.


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on November 25, 2020, 12:41:27 PM
Sorry for the delay in my replay – although the number of cases still is stagnating in Switzerland, the daily work has become demanding too due to the legal guidelines, huh…   

Thanks for your inputs, Bernhard and Havard!
@ Harvard
It may well be that I am slow on the uptake, but I do not really understand what you mean with the first sketch. How exactly should I interpret that bearing points? Sorry!
Anyway, I have to point out, that the space between the upperside of the motor/gear unit is limited due to the motor located very (!) close to the centerin pin…
 
(https://images42.fotki.com/v1416/photos/4/3824994/16308211/Antrieb_01-vi.jpg)

All the best,
Peter




Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on February 06, 2021, 01:44:25 PM
Hi

It has been quite some time since I could post an update here. Some further work happened in the meanwhile – not only successful…
First, an attempt to print the +GF+ coupler (widespread in Switzerland) in steel. Almost this would have worked  despite the thin walls… but only almost!
Unfortunatel the thin walls wraped slightly:

(https://images52.fotki.com/v1211/photos/4/3824994/16308211/Coupler_2B-vi.jpg)  (https://images46.fotki.com/v1660/photos/4/3824994/16308211/Coupler_1-vi.jpg)

So back to square one!


Much more successful were the reworked etching parts. Here the superstructure, the cab interior and the frame.

(https://images54.fotki.com/v101/photos/4/3824994/16308211/IMG_20210205_162603B-vi.jpg)   (https://images15.fotki.com/v1669/photos/4/3824994/16308211/IMG_20210205_162609B-vi.jpg)

I’am afraid of messing these parts up when soldering (here the lack of experience is noticable).
However, a first try with some spare parts in hard soldering with soldering paste looks promising.
 
Hopefully I will be able to show some successful results soon!


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on February 06, 2021, 02:41:19 PM
If that coupler is made of steel, perhaps you could heat it red hot, then press the thin part back into correct shape?


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on February 06, 2021, 03:02:31 PM
The couplers look beautiful. Too bad they warped. Given your skill and artistry, I am certain you ultimately will solder together the etched parts perfectly. The project looks extremely promising. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Design-HSB on February 06, 2021, 03:32:50 PM
Peter, wouldn't pressure in silver perhaps be the better solution? It can be if the steel is too hard that you can't straighten it.

Is the etching board from Solingen?

Definitely a nice project.


Title: Re: Narrow gauge tramway loco
Post by: Bernhard on February 06, 2021, 03:57:21 PM
Maybe it would be better to print/cast the couplers in brass. You could certainly straighten them better if they are warped.

Bernhard


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on March 11, 2021, 01:11:13 PM
Hi gents

Concerning working with brass I have to go through a long and steep learning curve. After some (or more) unsuccessful attempts with soldering, success is growing slowly but steadily.

First trials in bendig and soldering the etched parts (@ Helmut: Yes, from Solingen):

(https://images46.fotki.com/v678/photos/4/3824994/16308211/IMG_20210208_210934-vi.jpg)

(https://images15.fotki.com/v1669/photos/4/3824994/16308211/IMG_20210211_2127172-vi.jpg)


Then I received the gearboxes from my local caster. Now they have been sent to a precision mechanik to be reworked. But even as raw casts, all bores worked already fine !

(https://images20.fotki.com/v1666/photos/4/3824994/16308211/IMG_20210304_134342-vi.jpg)

(https://images54.fotki.com/v1224/photos/4/3824994/16308211/IMG_20210306_162417-vi.jpg)

And here my present efforts in hard soldering. It is easy to identify the first attempt  ;)

(https://images44.fotki.com/v802/photos/4/3824994/16308211/IMG_20210311_145010-vi.jpg)


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on March 11, 2021, 01:50:54 PM
Nothing wrong with any of that. I can't see any problems from those photos. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Barney on March 11, 2021, 03:38:46 PM
i Agree with all + great work
Barney


Title: Re: Narrow gauge tramway loco
Post by: Bernhard on March 12, 2021, 03:58:21 PM
Nice work, Peter!

Bernhard


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on March 13, 2021, 12:12:15 AM
Wow, nice work!


Title: Re: Narrow gauge tramway loco
Post by: Hauk on March 13, 2021, 03:15:23 AM
Both the bogie sides and castings for the mechanism looks mighty fine!

I am especially interested in the drive system. It will be very interesting to see how well it performs. The design looks very good, but the proof of the pudding is in the driving!


Title: Re: Narrow gauge tramway loco
Post by: Design-HSB on March 13, 2021, 07:06:41 AM
Hello Peter, absolutely all around everything succeeded.

I have been using successfully for decades, a GRIFFON - S-39 Universal flux from the Netherlands.

This allows even dirty corroded metal to be soldered.


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on March 13, 2021, 02:25:57 PM
Hi Helmut

I have just ordered it! Hmmm, a respectable price with those shipping costs! But it will last for another few years::)

Thank you all for your comments!


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on August 03, 2021, 01:11:58 PM
I have been using successfully for decades, a GRIFFON - S-39 Universal flux from the Netherlands.

Thanks to Helmut's hint I made some progress in soldering. Step by step it etched and printed brass parts are coming together:

(https://images42.fotki.com/v1257/photos/4/3824994/16308211/IMG_20210803_195553-vi.jpg)

The motorisation of the bogies is on its way too. Only the fact, that the wheels (Slaters) aren't exactly to scale dampen the joy, but I will try to design my own wheels - a great challenge for me...

(https://images44.fotki.com/v1644/photos/4/3824994/16308211/IMG_20210604_171246-vi.jpg)


Title: Re: Narrow gauge tramway loco
Post by: Design-HSB on August 03, 2021, 01:16:38 PM
Hi Peter,

I am pleased that you have first successes in soldering with S39.
The housing of the locomotive also looks good.


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on August 03, 2021, 01:27:44 PM
Excellent, neat fabrication. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on August 04, 2021, 10:00:48 PM
Fantastic! Very clean work.


Title: Re: Narrow gauge tramway loco
Post by: Barney on August 05, 2021, 02:53:22 AM
Excellent work Plus- very neat and clean - and well worked out
Barney


Title: Re: Narrow gauge tramway loco
Post by: Bernd on August 18, 2021, 05:12:33 PM
Hi Peter,

I'm the new guy here, but I've been on the net and forums for some time now.

I saw your question about pantographs. A while back I built four freelance design electric box cabs. I had to build mu own pantographs. Back in many years in a Model Railroader magazine was an article on building pantographs. Bob Hegge explained how he built them for his 1:48 scale electric engines.

Here's a couple of ones I built for my HOn30 box cabs.

(http://www.kingstonemodelworks.com/RLF/HOn30/Electric%20Boxcab/elecboxcab77.jpg)

(http://www.kingstonemodelworks.com/RLF/HOn30/Electric%20Boxcab/elecboxcab84.jpg)

I have a whole write up but haven't posted it yet to my website.

Bernd



Title: Re: Narrow gauge tramway loco
Post by: Bill Gill on August 18, 2021, 06:23:09 PM
Peter, that is impressively clean  and precise assembly. Your soldering skills have developed exceptionally well.

Bernd, Welcome to the forum. That is a good looking pantograph, and it's HO scale.


Title: Re: Narrow gauge tramway loco
Post by: Bernd on August 18, 2021, 07:02:02 PM
Thanks Bill.

I hope this is some help to Peter.

Bernd



Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on August 18, 2021, 11:49:26 PM
Wow! That is some mighty fine work!


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on August 19, 2021, 06:35:58 AM
Thanks for your feedback, gents!

After a long lean period, soldering is already fun – when you possess the correct tools😉

Here some progress: the engine stands on ist own feets and, unsurprisingly I decided to rework the vehicle frame. It simply wasn’t sufficiently exact!
(https://images46.fotki.com/v1671/photos/4/3824994/16308211/IMG_20210808_155126-vi.jpg)

The same problem with the wheels. After a long back and forth and after looking up the various standards I had to realise that the wheels don’t fit any of these standards – they were too narrow. So I am going to design my own wheels. Here a first attempt. No idea, if these printed steel parts are machinable at all…:-\
(https://images40.fotki.com/v1668/photos/4/3824994/16308211/IMG_20210817_104544-vi.jpg)


@Bernd
Your pantographs are looking very fine! I have ordered two 0-gauge Sommerfeldt pantographs to dissect them and to do my own ones in the right dimensions. Some oft the parts have to be replaced with brass castings. Here the CAD drawing. It looks, as if they can be printed in brass in such filigrane style…
(https://images40.fotki.com/v1668/photos/4/3824994/16308211/Stromabnehmer-vi.jpg)

Cheers,
Peter


Title: Re: Narrow gauge tramway loco
Post by: Bernd on August 19, 2021, 08:38:33 AM
Thank you Peter for the kind words.

I'll be following along to see how you make your pantographs with great interest.

Bernd


Title: Re: Narrow gauge tramway loco
Post by: Sami on August 19, 2021, 08:44:32 AM
I’ve never built locomotives and I admire your work.
It's beautiful !


Title: Re: Narrow gauge tramway loco
Post by: Bernd on August 19, 2021, 08:51:15 AM
I’ve never built locomotives and I admire your work.
It's beautiful !

Thank you very much.

It has taken many years on the acquisition of tooling and failed projects.

Bernd


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on August 19, 2021, 10:45:02 PM
Nice work!


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on August 20, 2021, 01:38:07 AM
Inspirational. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Hauk on August 31, 2021, 07:32:28 AM
The same problem with the wheels. After a long back and forth and after looking up the various standards I had to realise that the wheels don’t fit any of these standards – they were too narrow. So I am going to design my own wheels. Here a first attempt. No idea, if these printed steel parts are machinable at all…:-\
(https://images40.fotki.com/v1668/photos/4/3824994/16308211/IMG_20210817_104544-vi.jpg)

The engine seems to be progressing very well!
But who printed the metal wheels?

And I´m looking forward to hear how the machining of the wheels turned out!


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on August 31, 2021, 01:23:54 PM
Hi Hauk

As you know, first I wanted to use Slaters wheels. But you can make it out here: they are more then one millimeter too wide.

(https://images41.fotki.com/v1673/photos/4/3824994/16308211/IMG_20210824_163819-vi.jpg)

The idea with the printed steel wheels came up when I received the price calculation from «my» watchmaker. A brass wheel with a steel tyre would have been far too expensive. So I printed the whole wheel in Fine Detail Steel at i.materialise.com.

Cheers, Peter


P.S.  Some minutes ago my watchmaker wrote me, that the milling of the two prototypes was successful. I am very keen to see the result and will post an update here as soon as possible!


Title: Re: Narrow gauge tramway loco
Post by: Barney on August 31, 2021, 01:54:10 PM
Superb - the detail is excellent
Barney


Title: Re: Narrow gauge tramway loco
Post by: Hauk on September 01, 2021, 01:47:02 AM

The idea with the printed steel wheels came up when I received the price calculation from «my» watchmaker. A brass wheel with a steel tyre would have been far too expensive. So I printed the whole wheel in Fine Detail Steel at i.materialise.com.

Cheers, Peter


P.S.  Some minutes ago my watchmaker wrote me, that the milling of the two prototypes was successful. I am very keen to see the result and will post an update here as soon as possible!


I fully understand your concern for the wheels.
When you are going to dress up, the shoes are important!

Looking forward to see the machined wheels.


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on September 01, 2021, 02:58:39 AM
When you are going to dress up, the shoes are important!Looking forward to see the machined wheels.

And here they are. To me they look quite fine and so I ordered some plastic insulations from shapeways to put together one prototype wheelset. What do you mean with shoes? Brake shoes?

(https://images42.fotki.com/v1416/photos/4/3824994/16308211/IMG_20210901_103503-vi.jpg)


Title: Re: Narrow gauge tramway loco
Post by: finescalerr on September 01, 2021, 01:54:19 PM
He is comparing wheels on a locomotive or on rolling stock to the shoes we wear. The wheels (i.e., locomotive "shoes") you produced really look good. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Hauk on September 02, 2021, 04:40:07 AM
When you are going to dress up, the shoes are important!Looking forward to see the machined wheels.

And here they are. To me they look quite fine and so I ordered some plastic insulations from shapeways to put together one prototype wheelset.


The wheels look great!  Think I will try to test this route myself.
How well did the the dimensions of the printed parts compare with the STL-file you made?


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on September 02, 2021, 06:03:32 AM
Hi Håvard

So stupid! I didn’t catch the saying with the shoe… :'(

It’s difficult to judge the accuracy of the dimensions after turning them on the lathe. As I can make out the wheel width is exactly 2.0 mm as drawn on the CAD program. And the inner wheel diameter (16.2 mm) matches exactly the drawing too. So I can’t find any shrinkage…

(https://images15.fotki.com/v1674/photos/4/3824994/16308211/Prototype-vi.png)[/URL]


Title: Re: Narrow gauge tramway loco
Post by: Hauk on September 02, 2021, 07:37:43 AM
Hi Håvard

So stupid! I didn’t catch the saying with the shoe… :'(

It’s difficult to judge the accuracy of the dimensions after turning them on the lathe. As I can make out the wheel width is exactly 2.0 mm as drawn on the CAD program. And the inner wheel diameter (16.2 mm) matches exactly the drawing too. So I can’t find any shrinkage…

(https://images15.fotki.com/v1674/photos/4/3824994/16308211/Prototype-vi.png)[/URL]


That sounds promising! My only concern is the price. I got a quote based on a wheel center around 17mm in diameter, and it clocked in at around 35 USD.
How much did you pay for your parts?

(Don´t worry about the shoes, that was just me trying to be clever... 8) )


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on September 02, 2021, 08:03:31 AM
Just that's the point: One wheel cost 20.36 € postal charges not included. But since the entire project with all its trials and errors has become incalculable... ::)


Title: Re: Narrow gauge tramway loco
Post by: Lawrence@NZFinescale on September 08, 2021, 11:21:56 PM
This all looks really great.

On the issue of wheels and cost though:  It would be straightforward to resin print wheels in a castable material and then lost wax cast into bronze (or whatever).  Obviously you then need to machine and add a tire.

My experience doing this (and I've done quite a lot) is that it is much cheaper than the prices you mention.

Lawrence


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on September 09, 2021, 12:55:36 PM
Many thanks for your feedback! The difference to the other wheels is more then obvious and just that is the reason to follow this path!

(https://images40.fotki.com/v1668/photos/4/3824994/16308211/IMG_20210901_163933-vi.jpg)

@ Lawrence
As I do not have any machinery (Ok, a Proxxon drill and a soldering iron 😉) I have to bring all items to « my » watch maker and have to deal with his abilities. He didn’t wanted to do «such complicate things»! And of course, this way is not less expensive at all…







Title: Re: Narrow gauge tramway loco
Post by: finescalerr on September 09, 2021, 01:22:04 PM
The improvement is so huge a blind man could see it. -- Russ


Title: Re: Narrow gauge tramway loco
Post by: Ray Dunakin on September 09, 2021, 10:02:41 PM
The new wheel looks so much better than the others!


Title: Re: Narrow gauge tramway loco
Post by: Bill Gill on September 10, 2021, 06:46:12 AM
Peter, your decision to make new wheels paid off handsomely. A big improvement!


Title: Re: Narrow gauge tramway loco
Post by: WP Rayner on September 11, 2021, 12:00:11 PM
WOW... so much better. Well done indeed!


Title: Re: Narrow gauge tramway loco
Post by: Hauk on September 16, 2021, 03:38:01 AM
I totally agree that the finer wheels are well worth the extra cost and effort.

You are absolutely on the right track here!


Title: Re: Narrow gauge tramway loco
Post by: Peter_T1958 on September 16, 2021, 07:44:45 AM
Håvard, once in your tread about the «Wooden Ore Cars» I came to the conclusion that your work is far above the level I will ever achieve. That is still a fact, but I am sure your encouraging words help to improve my work within the next few years ;D

Thanks a lot all!


Title: Re: Narrow gauge tramway loco
Post by: 1-32 on September 16, 2021, 06:55:38 PM
Hi Peter.
Yes, I will just echo the other comments' quality work.
cheers Kim